Preparation method of catalyst for acrylonitrile fluid bed

An acrylonitrile fluidized bed and catalyst technology, which is used in physical/chemical process catalysts, hydrocarbon ammoxidation preparation, chemical instruments and methods, etc. and other problems to achieve the effect of ensuring long-term effect and high activity selectivity

Active Publication Date: 2010-06-16
吉化集团吉林市星云化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the above studies, the acrylonitrile catalysts were all produced by the traditional process. The nitrate, carrier silica and ammonium molybdate were made into a slurry, spray-dried, activated and roasted to obtain an acrylonitrile fluidized bed catalyst. There is no analysis of the state of the carrier, how the active components are distributed between the carriers, and there is no disclosure of the activity, selectivity, reduction resistance, long-term stability, etc. Research results

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  • Preparation method of catalyst for acrylonitrile fluid bed

Examples

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Comparison scheme
Effect test

Embodiment 1

[0083] Get 415 grams of ammonia-stabilized concentration 40% SiO 2 Silica sol, add 17 grams of tetraethylamine and make material A after fully stirring; 384.4 grams of ammonium molybdate are dissolved in 200 milliliters of water, make material B; 125 grams of iron nitrate, 72.9 grams of bismuth nitrate, 331.9 grams of nickel nitrate, 100 grams Magnesium nitrate, 18.9 grams of copper nitrate are dissolved in 600 milliliters of water to obtain material C; 1.3 grams of lithium nitrate, 10.9 grams of cesium nitrate, and 0.7 gram of arsenic acid are dissolved in 10 milliliters of water to obtain material D; Add D into A, stir well, adjust the pH value to 1.5 with 10% ammonia water, heat to 80°C, and the gauge pressure is 0.4MPa, spray dry and shape after 6 hours, transfer to the cremation furnace, heat up to 320°C, heat Decompose for 2 hours; heat up to 420°C, crystal phase transition for 8 hours; heat up to 580°C, activate and roast for 4 hours, cool to room temperature after acti...

Embodiment 2

[0088] Take 467 grams of ammonia stable concentration 40% SiO 2 Silica sol, add 24 grams of tetrapropylammonia and make material A through fully stirring; 384.4 grams of ammonium molybdate are dissolved in 200 milliliters of water, make material B; 100 grams of iron nitrate, 36.5 grams of bismuth nitrate, 258.1 grams of nickel nitrate, 66.7 Gram magnesium nitrate, 5.6 gram chromium nitrates are dissolved in 600 milliliters of water, make material third; 1.8 gram potassium nitrate, 0.5 gram boric acid, 4.8 gram beryllium nitrates are dissolved in 10 milliliters of water and make material D, will make material second, third, Add D into A, stir well, adjust the pH value to 1.5 with 10% ammonia water, heat to 60°C, and the gauge pressure is 0.2MPa, spray dry and shape after 8 hours, transfer to the cremation furnace, heat up to 290°C, heat Decompose for 2 hours; heat up to 440°C, crystal phase transition for 6 hours; heat up to 600°C, activate and roast for 2 hours, cool to room t...

Embodiment 3

[0093] Get 518 grams of ammonia stable concentration 40% SiO 2 Silica sol, add 10 grams of polyacrylamide, make material A through thorough stirring; 384.4 grams of ammonium molybdates are dissolved in 200 milliliters of water, make material B; 75 grams of ferric nitrate, 109.4 grams of bismuth nitrate, 184.4 grams of nickel nitrate, 33.3 Gram magnesium nitrate, 4.4 gram vanadic acid are dissolved in 600 milliliters of water, make material third; 1.4 gram phosphoric acid, 2.1 gram stannic acid, 4.9 gram cesium nitrate are dissolved in 10 milliliters of water and make material D, will make material second, third, Add D into A, stir well, adjust pH value to 2 with 10% ammonia water, heat to 100°C, gauge pressure 0.6MPa, carry out spray drying and molding after 4 hours, transfer to cremation furnace, heat up to 300°C, heat Decompose for 2 hours; heat up to 440°C, crystal phase transition for 8 hours; heat up to 620°C, activate and roast for 2 hours, cool to room temperature after...

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Abstract

The invention relates to a catalyst used in acrylonitrile manufacture. The method for preparing the catalyst comprises the processing steps of spray molding, pyrolysis, crystalling phase conversion, and activation roast, and is characterized in that template agent is added in a carrier at first, and the template agent is at least one of tetraethylammonium, tetrapropylammoniumsilicate, polyacrylamide and ethylsilicate; active components are added in the mixing material above mentioned, and the pH value is controlled between 1.5 and 2.5; the mixture is aged before spray molding, the aging temperature ranges from 60 to 120 DEG C, the operating pressure ranges from 0.01 to 0.8Mpa, and the aging time is 1 to 10 hours; the catalyst prepared according to the proposal contains a silicon dioxide carrier and a combination, the chemical formula of which is AaBbCcDdMgeNifBigFehMoiOx calculated on the basis of atomic ratio, wherein, the chemical formula can include Li, K, Cs, Rb, As, B, P, Se, Cu,Sn, Ga, Sr, Ba, Ce, Cr, V, Sb, La and Co. The catalyst has good activity, selectivity, anti-reducibility, and abrasion resistance and can be used in a reactor form a long time, and the service life can even reach more than three years.

Description

technical field [0001] The present invention relates to a catalyst, and more particularly to a catalyst for the production of acrylonitrile. Background technique [0002] Acrylonitrile is one of the important petrochemical products, mainly used in the manufacture of acrylic fibers. The Sohio method is widely used in the world to produce acrylonitrile by ammoxidation of propylene. The key technology in this process is the preparation of fluidized bed catalyst in the reactor. For the research on acrylonitrile fluidized bed catalyst, most of the research in our country is currently focused on the composition of chemical components, research on the application of high molybdenum active components, fine particle size in supplementary catalysts, research on α-molybdenum-bismuth-iron and γ-molybdenum The bismuth-iron system affects the yield of acrylonitrile. In the actual production and use process, it is found that some catalysts have high activity in the initial stage, and afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J27/199B01J27/192C07C253/24C07C255/08
CPCY02P20/52
Inventor 于广臣刘淑杰林君
Owner 吉化集团吉林市星云化工有限公司
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